Lost soul (Doom 3)

The lost soul in Doom 3 is a head-sized flying demon consisting of a human face mounted on a flying rocket engine contraption. Its jaws are torn apart to allow it to open its mouth wider than a normal human could, and its teeth have mutated into long, pointy needles.

Lost souls hover through the air at average speed, and attack by abruptly rocketing in a straight line toward the player at high speed and ramming into them, similar to the classic lost soul. Unlike the classic lost soul, however, Doom 3 lost souls can cover a larger area and can change course mid-charge. The lost soul is usually found in packs with other lost souls (which was often the case in the classic Doom games as well). Lost souls can be problematic opponents if the player does not manage to kill them quickly. They first appear in the EnPro facility.

The first appearance of a Lost Soul occurs in a grotesque cutscene with Theresa Chasar, one of the few female UAC employees stationed on Mars. When the marine approaches, she whispers, "help me," then her facial skin starts to shrivel inward while acquiring a horrible pale color. A lost soul then bursts out of her head, ripping out her spinal cord in the process.

Tactical analysis
Doom 3's version of the lost soul is very weak. Having only 20 health, it can be taken down by a single punch if necessary, and it can be killed by two hits from the pistol. The machine gun or plasma gun are more advisable due to these weapons' high accuracy and rapid rate of fire, especially when lost souls are encountered in groups. The chaingun is arguably not as good a choice due to its inaccuracy and the small size of the lost soul. Despite their low health, lost souls should not be underestimated due to their small size and fast speed while charging, and the levels generally being more cramped than in the classic version with less room to dodge.

Unlike other enemies, there is no increased damage by achieving a "head shot" against the lost soul - they are essentially all head.

The Resurrection of Evil expansion pack replaced the lost soul with a new monster called the Forgotten One, which bears a closer resemblance to the classic version of this monster.

Appearance statistics
The lost souls appear only in few levels, but often in large numbers.

Doom 3
The enemy count on Nightmare is the same as on Veteran.

Resurrection of Evil & The Lost Mission
The lost souls do not appear in Resurrection of Evil and The Lost Mission, as they were replaced by the Forgotten Ones.